Protective relay



FIG. 1 is a front view of a protective relay of our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a view of the right side; and,

FIG. 5 is a view of the left side thereof.

The bottom of the protective relay is plain and unornamented. 

The ornamental design for a protective relay, as shown and described. 